Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4696e69e47e077…

MALICIOUS

PDF

82.6 KB Created: 2021-09-10 14:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b686d63ce0c9ee715bb7433bd0b8fce SHA-1: 6be30389a5d1d0af5e5ae4aa600c4680ae73457c SHA-256: cf4696e69e47e077416591930b8954ef2dd994037fa3d6214b5def3fe4a3e2de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating a strong intent to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious content, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://huntic.ru/uplcv?utm_term=dynasty+warrior+mobile+apk
    • http://cancercareresearch.com/userfiles/file/63092713327.pdf
    • http://geoodwierty.pl/files/file/lowekibub.pdf
    • http://fuku-zou.com/userfiles/file/labefa.pdf
    • https://gdaniec.com/upload/files/82695746102.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131679c86e9f---40482355840.pdf
    • http://pcwenhua.com/uploadimg/file/1631254154574378144.pdf
    • http://robwalker.net/fckupload/file/pagowov.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e741bff5d---12675669938.pdf
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/91381739840.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131aac8cde77---12217064121.pdf
    • https://highrise.pl/file/8130899526.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16137812d56432---58122560756.pdf
    • http://katyababash.com/images/uploads/file/51720808633.pdf
    • http://karinameal.ru/imgdish/files/79469811333.pdf
    • https://ajitcoatings.com/uploads/11409159143.pdf
    • http://goopenapp.com/uploads/files/38885731060.pdf
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/97669551137.pdf
    • http://marktoby.com/akram/know_news/admin/userfiles/file/vobupunapobol.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/0c311caa06a1ac710276bbf436acb732/75127923734.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613631878987d---lenub.pdf
    • https://betamachinery.sa/other_files/File/72875597615.pdf
    • http://doubles301.jp/files/ckeditor/files/xepuwedasorusuguge.pdf
    • http://hajnysport.cz/FCK_userfiles/file/mofimudamogixel.pdf
    • http://machin.kr/userData/board/file/19573478756.pdf
    • http://web-news.eu/www/pkpar/userfiles/file/71052992967.pdf
    • https://piauiaqui.com/ckfinder/files/43488533074.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db2a.bin
209cb7ba710195a3a4519c36de1dc2c1c10c200854fa595ef7cdf440bad6118f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2A 10848 bytes
font_01_sfnt_off0000f413.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF413 16792 bytes
font_02_sfnt_off00010c25.bin
4e60e92368da26efb97cb17df1076f35427b57e356ca58799c6742a9d1097656
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C25 18664 bytes